This picture was stolen and sold through a site called Art4Love/MarkYourSpot. Both sites are now down, but you can seen a screen shot including your piece here [link] Many artists from DeviantArt have been victims of this thief, so they are banding together in a lawsuit. For more information please read this [link] I am not familiar with your gallery in it's entirety so there may be other images of yours in those screen shots.